[1] Univ Malaya, Dept Mech Engn, Fac Engn, Kuala Lumpur 50603, Malaysia
[2] Univ Malaya, Dept Chem, Fac Sci, Kuala Lumpur 50603, Malaysia
[3] Univ Putra Malaysia, Dept Chem Engn, Fac Engn, Serdang 43400, Malaysia
[4] Univ Putra Malaysia, Inst Trop Forestry & Forest Prod INTROP, Serdang 43400, Malaysia